.

Gemfile.lock

@@ -232,7 +232,7 @@ GEM
       websocket-driver (>= 0.2.0)
     polyglot (0.3.4)
     powerpack (0.0.9)
-    premailer (1.8.0)
+    premailer (1.8.1)
       css_parser (>= 1.3.5)
       htmlentities (>= 4.0.0)
     pry (0.9.12.6)
@@ -289,8 +289,7 @@ GEM
       parser (~> 2.1.3)
       powerpack (~> 0.0.6)
       rainbow (>= 1.99.1, < 3.0)
-    sass (3.3.0)
-      rake
+    sass (3.3.1)
     sass-rails (4.0.1)
       railties (>= 4.0.0, < 5.0)
       sass (>= 3.1.10)

app/models/post.rb

@@ -2,7 +2,7 @@ class Post < ActiveRecord::Base
   has_many :post_tags
   has_many :tags, through: :post_tags
   belongs_to :author, class_name: 'User'
-  has_many :comments, inverse_of: 'posts'
+  has_many :comments
 
   default_scope  { order(:updated_at => :desc) }
 

app/models/user.rb

@@ -8,7 +8,7 @@ class User < ActiveRecord::Base
   devise :omniauthable, omniauth_providers: [:google_oauth2]
 
   has_many :posts, foreign_key: 'author_id'
-  has_many :comments
+  has_many :comments, foreign_key: 'author_id'
 
   scope :post_recently, -> {
     User.joins(:posts).group('id').order('posts.updated_at desc')